2. Some data may not yet have been stored for certain types of roads or in certain regions.

3. The content described in this table is based on the National Digital Road Map Database Standards (current standards). Additional data content has been included based on the DRM Standard Format 21. For example, road data on minor roads (from 1.5 to 3 meters in width, with a total length of about 430,000 kilometers as of March 31, 2008) and ferry routes has been included.